Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A mineral form of titanium dioxide, TiO2, having characteristic orthorhombic crystals and a red-brown to black color.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A dark brown mineral form of titanium dioxide, with the chemical formula TiO2.

from the GNU version of the Collaborative International Dictionary of English

  • n. A mineral consisting of titanic oxide, and hence identical with rutile and octahedrite in composition, but crystallizing in the orthorhombic system.

from The Century Dictionary and Cyclopedia

  • n. One of the three forms in which titanium dioxid occurs in nature.

Etymologies

After Henry James Brooke (1771-1857), British mineralogist.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

  • Rutile is made up mostly of titanium dioxide with two rarer polymorphs anatase or octahedrite, which is a tetragonal mineral of pseudo-octahedral habit, and brookite, which is an orthorhombic mineral, the Doctor explained to her.

    Update

  • A set of specimens was exhibited by the Ellenville Zinc Company, consisting of strikingly beautiful crystalline masses of quartz galina, sphalerite and chalcopyrite and specimens of the rare mineral, brookite.

    New York at the Louisiana Purchase Exposition, St. Louis 1904 Report of the New York State Commission

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